pofita in ifta difFerentiatiooe </ r conlJamL Tum vero 

 quia efl: 



T = - G G cjr -4-/t^ ( 2-f ) ( '^) , ob- - 



quia eft 



(^)=-Va(5-f).-(f^), 



hinc colligitnr- 



T ('if)= + (if)/^^ (:-?)(?#) =^ f /-^ (i^), 



■ponetido- nimirum heic fihiph'citer (J|) — *. His valori- 

 bu,s fiiff&dis ifta prodit aequatio: 



ideoque , 



qiiatenus fcilicet in iutegratione termini ii(^),.^ habe- 

 tur pro conftanti. ...^ 



Ctim fupra qnando curua in ftatu initiali figuram 

 obtinet circnlarem inuentum elfet A ~ -+- -^ , meric6 



2 a- ' 



quacrifhr c-ur pro cafu praefenti penitns euanefcat , ve- 

 rum perpendendum eft terminum fummatorium /^' \^; (j^ 



iam ipfum A inuoJuere. , 



.rn'! 



s..: 



C 2. §. II. 



